US2972827A - Perpetual calendars - Google Patents

Description

Feb. 28, 1961 J. E. LEWIS PERPETUAL CALENDARS Filed May 31. 1960 3/\ FIOI ff 2 l K q I* o /5 JANUARY /F FEBRUARY MARCH APRIL L SMTWTFS MTWTF'S SMTWTFS F n lI2 I|I2I3I4I5j ITI I I`I'I7 INVENTOR. f5? JAMES E. LEWIS mf d/M/ TORNEYS Feb. 28, 1961 J. E. LEwls PERPETUAL CALENDARS 5 Sheets-Sheet 2 Filed May 31, 1960 illu-haii Ililllllillllllllll N .O u

Feb. 28, 1961 .1. E. LEWIS PERPETUAL CALENDARS 5 Sheets-Sheet 3 Filed May 31, 1960 INVENTOR. JAMES E. LEWIS Feb. 28, 1961 1 E` LEWIS 2,972,827

PERPETUAL CALENDARS Filed May 3l, 1960 5 Sheets-Sheet 4 ZOE u? f zo mm mz m 202200 Feb. 28, 1961 J. E. LEWIS PERPETUAL CALENDARS 5 sneets-sheet 5 Filed May 3l, 1960 mm @Om com INVENTOR. JAMES E. LEWIS ZM/4v ATTORNEYS v been inherentlyy subject to error byv reason of the compilifl'- United States Patent io 12 claims. (Cirio-114) This invention relates to .af calendar, particularly a perpetual calendar ofthe kind adapted to sh'ow,the date of any day of any'selected year.V

Oftentimes -itis desiredto determiney particular information about a certain yeaiqor group of years. yFor xample, it may be important Vto be able tond lfthe. day 20 of the week for any date in a certain year. Asa further examplev it may be desirable to determine all of the months beginning on Sunday in a particular year.

Various systems and arrangements for 'a perpetual calendar have heretofore beenY proposed. Thus, conrplex formulas have been derived andy elaborate charts and the like have beenv developed in attempts toy provide information of this sort. However?, the formulas, charts and* thelike lasA heretofore proposed havfg'en A riiredmaonplicad 'inanipful'ation'I proeediirnfor each itemV of information obtained.- Conseoueny, hev

formulas," charts Vand thel likey heretoforel .proposed have had' limited utility, and theM information obltainedwhas I cated process* required` for extracting*ltheffinrormation. Moreover, the formulas, charts and the. like as yheretofore 'proposed oftentimes are;v validl and accurate for only a certain span of years.l Y l It is therefore a primary'objectofithe ,presentiinv tion toenable afcornplete calendar for anyl selected/year; to be vievved in its entirety at `ontertirne ltisfa related, object to, showfsimultaneously 'the date forQall Aof. days yQffanyA selected *year inra conventional. calendar, l. formula. i" .A v ,A flt a ,furtherV objee fthe presentjinvent structa perpetual'calendar that once set forfaqn Yyear is a leap yearor a common year.

O rice 2 viewingA apertures are substantially coextensive in length with a face on a rod and are', marked with .mont-h and day identifying data. Also, the viewing apertures are etfec- Y tive to permit onlyfone face or rod to be viewed in any one time. The rods are interconnected for rotation with one'another and in equal `angular yamounts about their respective longitudinal axes so that the rods can be rotated to enable different combinations of rod faces, corresponding to different years, to be coordinately presented for view. The perpetual calendar of the present invention also includes mechanismfor selectively Arotating the rods allocated to March through December one-V seventh of a complete turn with respect to the rods allocated to January and February to vary the starting dates of the months of March through December by one day to compensate for leap years. 'fo set the calendar vincorporating this heptagonal-faced rod arrangement for any selected year, the operator Yneed know vonly the day of thepweek, thatv the year `,starts on and Whether the y Y This latter information can be Ydirectly'obtained from a chart listing this `information opposite a chronological arrangement v of years. With this information in mind the calendar can be set forthe selected year in a quite simplejmanner v merely by rotating the rod allocated tothe rst week inJanuary vto fpresentpthe proper face to view at-the corresponding vievving apertures, and, if necessary, making a slight additionalkcornpensation for a leappyear setting.

` lrialsrnuehn'asr all ofthe remainingrodsof the fc'alendar to setsup the complete calendar` for the vselected year. Moreover, once thqcalendar isjinitially set for any-se' lecrted year, the calendar need not be `reset to `determine any otherinformationfor the entireyear. It` isV another i object of the present invention to incrporatethe foregoing structural features' effective tofunction inthe manner described ina novel.perpetuahcalendart-I It stillV a Afurtherv object fof-the present-,invention to incorporate a mechanismf .for visuallyv indicating whether a" leap year or a common year has been selected inY a perpetual calendar. which incorporates the foregoing structural features. i

' Other and furtherobjects ,ofv the 'present invention rvivill bef'apparen't fromthe'` following` descriptionand claims andare illustrated in thel accompanying drawings which,

Ibyyvay of illustration, vshow fa preferred embodiment '-*II'n the draiving y l.

, y rig; -1 :'igfpnn yie'mpariiailyfbiien aiiiy'mpn tos-how details" of construction,of'a;perpetual calendar: v `constructed vin accordan'cevwith one embodiment'of th`ef` f Y Fig: i is a s'idefelevationvi-vv taken approximately g-Eiggk safgperspectiye. viewf illustrating a5-frame as-` each of which isaligned with a corresponda?? @amasar Fig. 4 is an elevation view in section taken substantially along the line indicated by the arrows 4-4 in Fig. 1;

Fig. 5 is an elevation View taken substantially along the line indicated by the arrows 5-5 in Fig. 4;

Fig. 6 `is a fragmentary elevation View in section taken substantially along the line indicated by and in lthe direction of the arrows 6--6 in Fig, 4;

Fig. 7 is a fragmentary elevation view in section taken substantially along the `line'indicated vby and in the direction of arrows 7-7 in Fig. 4;

Fig. 8 is a perspective view of a rod member iucorporated in the calendar illustrated in Fig. 1; l

Fig. 9 is a view of a part of a chart which may be utilized in conjunction with the perpetual calendar illustrated in Fig. 1 to determine the day of the AWeek on which any selected year starts as well as whether the selectedyear is a common year or a leap year;

Fig. 10 is a chart showing the fourteen different conibinations of rod faces for the calendar illustrated in Fig. l for any and all set-ups;V

Figs. ll-ZG are layout views of the different rods utilized in the calendar illustrated in Fig. l; and

Fig. 21 is a somewhat schematic View of mechanism of visually indicating whether` a leap year or common year has been selected in the calendar illustrated in Fig.Y 1.

in Fig. l a perpetual calendar constructed 'in accordance with one embodiment of the present invention is indicated generally by the reference numeral 31. in Vthis instance the calendar 31 is arranged to present the twelve months of a year in a format of three groups of four months each. Thus, January, February, March, and Aprilare alignedk horizontally in the top group of months while May, lune, July, and August are includedy in the center ygroup and September, October, November, and

Eec'ember are includedk in the lower group. This format Y enables a compact mechanism to be obtained. However, as will become more-apparent from the description to follow, otherl formats can equally well `be utilized. Thus,

' by way of example, the twelve months of a year could yso 4 Y tures 39 in the side rails 34 and 36. This construction enables pairs of heptagonal-faced rod members as 48 and 49 (see Fig. 3), each of which is half as long as a rod member 41, to be mounted for rotation between the side rails 34 and 36. Thus, a rod member 49 is formed with a projecting stub 51 at' one end thereof and which is adapted to tit within an aperture 39 in the side rails 36. The opposite end of the rod member 49 is formed with a circular bore 52. The rod member 48 is formed with axially projecting stub shafts 53 and 54 at the opposite ends thereof. The stub shaft 53 is adapted to be received within an aperture 39 in the side rail 34 while the stub shaft 54 is adaptedto project through an aperture 47 in the center rail 46 and tit within the circular bore 52 of the rod member 49 to thereby support both of the rod members 48 and 49 from the center rail 46.

The center rail 46 has been omitted in the broken away portion of Fig. 1 to simplify and clarify the showing of a drive connection between two rod members 48' and 49 presently to be described.

The entire frame assembly 32 isadapted to nest Ywithin an open-top container `56 which thus affords a protective and decorative exterior for the frame assembly 32.

The calendar 31 also includes a top-cover plate 57 which is positioned above theframe assembly 32 and associated rod members' and which is suitably attached to the lower container 56 in any suitable manner. Thus, cap screws or like fastening devices, not illustrated in the drawings, can ybe utilized for this purpose. The

A cover plate` 57 is formed with viewing apertures 6i) which are marked with weekday identifying data and which are adapted to coact with corresponding faces on the rod members 41, 48, and 49 to present to View numerical 'calendar data carried on the faces of the rods .r in themanner illustrated inl-"ig,` l and subsequently to be described in greater detail herein'.v

plate 33 and a'pair of side rails 34 and 36 aiiited therefy i to. The side rails 34and36 are Preferably removably secured to thebottom platey33 in any suitable'manner such asrby screws or the like, and reinforcing angles 37. and 38 are attachedy to the respective sider rails j34 and rails with the bottom platel' Each side rail is lformed with a plurality of equally spaced circularapefrtures 39 which are aligned withcor'responding apertures` 39 inthe opfposit'eside rail. In theformof the invention illustrated in Figs. 1-3, each siderail is formedwitheighteeri such Thus aligned apertures 39 in the side railsv 3.-evandf.y Center railll.` is additionally form'ed'with' apertures;

Each of the rod members 41, 48, and 49 is composed of individual rods longitudinally aligned'with onea'nother, Thus, the rod member 41 illustrated in Fig. 3 includes three individual rods, each designated by the numeral 6 and a fourth 'rod 6A'. Likewise, the 'rods V'48, and 49 illustrated in Fig.V Stare each composed of` two individual t rods, eachudesignated bythe numeral` 4. `1Anfaccordance with the present invention each ofthe Vtwelve rod mem;

- bers `41, s ixrod membersV 48 and six rodmembe'rs 49 is composed of dijerent combinations of only Vten separate and distinctY rods, and these rods are designated by the numerals 1-6, SA, 6A, 5B, and 46B in the 'layout views of Figs.-11'20. lThe characteristics ofi these individual v.rods will be described `in greaterdetail hereinafter, but

at this-time it should be noted that the individual rods are to `be incorporated inthe rodmernbers as 41,v 48T, and 49 iii-a predeterminedk manner whenever aisideJby-s'ide arrangementy of months ias illustratedin `Figldl'is to be 36 and the' bottom plate 33 at the .juncture oft'he side In *whatever arrangementy 'of'months is vto be utilized 'in a'perpetual calendar constructed'in accordancewith the present. invention; individual rods as `illustrated,fin'Figs.

*Il l-20 are" arranged'in groupscorresponding t'othe' twelve Y 'months of a year Vwith suliicien'tjrods ineach 'group 'for presenting all possible-weeks in'"anygmonthiY '1`jliusj-and `'as' -isapparent from; an inspection oftFig'. 1; itjs possible.` to have days withinjsixV different'weeks'in,the'montlifof`V `1 iiililiegfeim.ofdefensin@ iiuseadiiifri side-byfsid'arrangementoff tional rod, rod 6B illustrated fin `,Fig.f2(v), which-al1 the faces of the rodv are blank, hasQbeen'i/ncluded for the month of February to facilitate'mechanical construction of the calendar 31 as will becomeflmore apparent from the description to follow. j j l As noted hereinabove, respective Figs. ll-ZOV illustrate in layout view the individualvrods incorporated in the calendar 31. In these figures the letters A-G arerfor descriptive reference only and' are notjineludedin an actual calendar mechanism. `rlfheLrelationship of the'rods shown in Figs. 11-20 will best be appreciated by vconi-A paring the rodsY illustrated in Figs. 115,29 Ywith the per'` spective view of the. rod member 41j ustr'ated inl-iig.y 8. Thus, the rod member 41 illustrated 11rlli`ig." 8)is'aY *.soli'd; one-piece member composed 'of four individual rods 1 each having numerically markedfaces `as killustrated'V in Fig. 13 of the drawings. Each r`o`d 1 in the'wrodA member 41 includes seven faces designated bythe respectivereference numerals A-G in Fig. 13.1 In this instance the rod member 41 provides the individual rods1j for the lirst weeks of each of the months of May, June, July, .and August in the calendar 31` illustrated in Fig. 1. VFor the year 1960 face G ofthe rod lallocatedto the irst yweek in May is presented to view in the Vaperture 60. Likewise the face D of the rod `1 allocated tothe firstweek in-June is presented to view, and the facesB andFv of the respective rods 1 allocated to the first weeks in the respective months July and August are presented to view.' A

v Each face of. each rod isvformed with seven 'divisions corresponding to the'seven days of a week and the given date numeral for each of the seven days of the weekis afforded by the'arrange'ment of the numerals in the divisions of the respective 'faces Vof therods aswillbe apparent from an'v inspection of/Figs. ll through V2 0. Thus, by a Vproper selection ofthe individual rods andproper orientation of the'rods in each Vmonth by group,.al1 of the ,numbered days in .a month can b eshown in `serial order' regardless' of the daylof 'theweekjon'which the 'month starts'. By way of example;'JanuaryA which has thirty-one kdays,lrequi'res` one each of then rods 1 through 6` illustrated in the respective' Figs.f 13l8. lffhesixjrods thus.allo cated toiJanuary are" initially orientated with respectrto one another "so that corresponding faces of yeach of the rods are simultaneously presented for view at. the aperture 60 in the manner illustrated in Fig. 1. Each of themonths of March, May, July, August, October, and December also have thirty-one days and therefore require the same rods 1 through 6 as allocated to the month of January. Thefmonths of April, June, September, and November have only thirty days. 1 For these months appropriate rods l5A and 6A, shown in respective Figs. llfandllZ, which arermarked for-a 30-day month rather a 31-day month r`are associated with rods 1 through 4 illustrated in respective"Figs.,l3- 16. In the case of February which has twentyeight days in a common year or twenty-nine days in a leap yeargrods 5B`and 6B as illustrated in Figs. 19 and 20 are associated with rods 1-4.` In the case of vrod 5B the` 29th day of February has been designated by the reference character L rather than a numeral 29- to minimize any possible conflict with the first day vof Marchin the case lof a common year; or non-leap year.` Also, and as noted hereinabove, since February cannot have more than tive weeks, all sevenfaces ofthe krod v6B are blank. f

A In `accordance with the rpresent' invention operating means @areincluded in thel calendar 31 'for rotating the Arods allocatedY to the respective months in'-l unison vand. ink equal angularramounts about their respective longiftudinal-axesto presentditerent combinations of rod faces, corresponding to different years',-in viewingfposi-r stantially 51 degrees. A pin74 projects from the disk tion at the apertures 60 in the coverplate:57L:"Withfr jeferenceto the broken away showing'infFig.1 as .well aSrrFg-c 2, it fis. Seen'fth'at the;v operating.`means1finc1ude sprockets@ which, are suitably txcdafor rotatxpni with the rod members 41T @11549, as byfbeiag keyed onfthe' stub shafts'43 andr 51. A chain belt 67 is' engaged withr ltionof-any one sprocket, as fby` knurledk'nob 68 (see Fig-l), is eifectiveftosrotate eachl ofthe other sprockets an equal amount.; Thus, each of the rod members 41 and 49, corresponding fto the months of Marchthrough December, `are adapted .at all times to be rotated with one another in either direction of rotation.A Y

. The rod members 48, corresponding to the months of January and February, are alsoconnected forrotation with therod members 41 vand 49 and in equal angular amounts therewith. .Howeventhe means affording the connection between therods allocated to the months of March and Apriland the months of January and Feb'- ruary; include valost-motion connection which permits one-seventh of a turn ofrelative rotation between the rods` allocated to the months of January and February andthe rods allocated to the remaining months of the year ,to compensate for .leap years `as will now be described.

With particular reference to Figs. 4-7, it is seen that the :above-noted lost-motion connection is afforded by a pin and slot construction associated with the rod members 48 and 49 which comprise the respective ro'ds 1 allocated to the first week in each of the months' of January, February, March and April. In this instance the adjacent ends of the rod members 48' yand 49" include disk members `71 and 72. The disk member71 is formed with an arcuate slot 73 extending throughanangle Vof subi member 72 su'iiciently far to have the-free endthereof disposed within theslot 73 so as to be engageable .with the end surfaces ofthe slots73. It willthus be` apparent from an inspection of Figs. 4-7 that, depending upon the initial disposition of the pin 74 within the slot 73 and the direction of rotation of the rod member 49,the,rod member 49 may berotated one-seventh of a turnrelative tothe rod member 48` prior to producing any rotationzof the rod member-48. l

yEach of `the remaining rod members 48,k which, are composed of the remaining rods allocated` to the respective months'of January and February, are connected for rotation with the rod member 48 by a series of sprockets 76 and a linkV belt 77 similar to the sprockets 66 and link belt 67 described hereinabove with reference to the mechanism for rotating the rod members 41 with the Vrod members 49. v

The calendar 31' of the presentfinvention is adapted to be set for any selected year by rotating the knurled knob 68 in a clockwise direction, as viewed from the right side of the calendar 31 illustrated in Fig. 1, to position. the proper face of the rod 1 allocated to the rst Week in January at the viewing aperture 60. "Thus, for either a common year or -leap year the .knob 68 is rotated in the above noted clockwise `direction until' the numeral 'l Vl is positioned beneath the proper day of the' week for the selected year.. Each of the `rods of the calendar 31 is trained for rotationv withthe rod'1 allocated to the irst Week in January through the sprocket and belt mechanism the month of February hasone'extraday, thepstart'ing dates -of each off-the months of'lVarchto4 vApril'are'd'elayedfb'y one'day..r Thef-lost-motion'lonnection atorded betweenv the rods'--allocateduto`months "of January and February and the rods allocated to the remaining months of the year enable the necessary shifting of the numeral dates of the months of March through December to be obtained.V That is, the one-seventh of a turn of relative rotation afforded by the pin and slot connection 74 and 73, described in detail hereinabove, enables each of the rods allocated to the months of March through December to be rotated one-seventh of a turn in a counterolockwise direction, as viewed from the right end of -the calendar 31 illustrated in Fig. 1,. to shift the numeral dates for each of the days in these months by one day to compensate for the extra day included in the month of February in a leap year.

Thus, one additional combination of rod faces can be effected for each of the above-noted seven combinations, so that a total of fourteen different combinations of rod faces at the viewing apertures 60 suflice for any and all year set-ups. The fourteen possible combinations of rod faces for rod 1 of each month have been charted in Fig. 1 0 wherein the combination of rod faces corresponding to the leap year 1960 is set out in the line numbered 9. By comparing Figs. 1 and 10 it can be seen that the relative disposition of the rod faces-indicated in Fig. l corresponds to that set out in line 9 of the chart in Fig. 10. Thus, once the individual rods have been initially oriented with respect to one another in the manner illustrated in Fig. 1 and connected for rotation in the manner described hereinabove, it is necessary to know only two facts to reset the calendar for any selected year. The day of the week that the year starts on must be known, and it must be known whether the year is a leap year or a common year. Both of these factors can be read directly from a chart, as illustrated in Fig. 9, wherein the starting date of the 'week of the year and the designation of the year as a leap or a common year is positioned beside a chronological listing of years,

In brief summary the operation of the calendar 31 is as follows: the starting date of the week of the particular year to be set on the calendar 31 as well as the designation of the year as a common year or a leap year is determined, as by having reference to va chart like that illustrated in Fig. 9.- The control knob 68V is rotated in a clockwise direction as aforesaid to set the date January 1 in alignment with the proper day of the week. If the year is a common year no further manipulation of the calendar 31 is required, and the correct dates for each day of the selected year are shown simultaneously in a conventional week-by-week calendar format. However, if the year is a leap year, the control knob 68 is subsequently rotated one-seventh of a turn in a counter-clockwise direction as aforesaid to rotate the rods allocated to the months of March through December oneseventh of a turn and thereby shift the numeral dates of each of the days of the months of March through December by one division to compensate for the extra day'and the month of February while the settings for January and February remain undisturbed. After this slight adjustment of the calendar 31 to compensate for the leap year, no further manipulation of the calendar 31 is required. When it is thereafter desired to reset the calendar 31 for some other year, the control knob 68 is again rotatedL in a clockwise direction. In no case will it be necessary to rotate the control knob 68 more than six-sevenths of a complete turn. The maximum amount of rotation that is required of the control knob 68 is that necessary kto reset the calendar for the next succeeding year, in which `case it is necessary rto rotate the control knob 68 six-sevenths of `a turn.

,'Ihus, to reset the c alendarl from the set-up from the year 1960 to the yset-up for the: year 1961, the knob 68 is rotated in a clockwise direction six-sevenths of a turn. This has the eect ofrotating the rod 1 allocated tothe first Week in January through ve-sevenths of a turn since one-seventh of la turn of relative rotation betweenthe rods .1 allocated tothe months of. March yand April and the rods 1 allocated to the months of January and February is permitted by reason of the lost-motion connection therebetween prior to any rotation of the rods 1 allocated to the rst weeks in January and February. Thus, face B of the rod allocated to the first week in January is shifted from beneath the aperture 60 and the face G is shifted into View, as willbe apparent from an inspection of Fig. I3. The numeral 1 on theV face G of rod 1 is thereby positioned for the starting dayr of the week (Sunday) of the year 1961. Inasmuch as the rod 1 allocated to the lirst week in March is rotated six-sevenths of a turn, face E is shifted from view and face D is shifted into viewing position at the aperture 60. With reference to Fig. 13 it will be noted that this is the proper face for the rst week of March in the year 1961. The proper faces of each of the other rods of the calendar 31 are likewise positioned at the viewing apertures 60 by the above-described clockwise rotation of the control knob 68.

In accordance with the present invention retaining means are preferably included in the perpetual calendar 31 for retaining the calendar in any selected yearly setup. With particular reference to Figs. 4-7 one form of retaining means is shown as including a spring-type latching detent 81 of a V-shaped configuration in which the apex of the V is adapted to seat within complementary shaped notches 82 formed 'in the periphery of the disk member 71.

, Also, means are preferably included in the calendar 31 for visually indicating whethern the calendar is set up for a common year orfaleap year. As illustrated in Fig. 1 the indicator means are designated generally by the reference numeral 86 and include an arcuate-shaped cutout or window 87v formed n the cover plate 57 beneath which a pointer "88 is swingableto indicate either a leap year or a common year.

With particular reference to Fig. 21, one form ofa mechanism for accomplishing swinging movement of the pointer 88 is illustrated. Thus, the outermost end portion of the rod member 49' is formed with external threads 89 of relatively high pitch and includes a washer 91 suitably attached thereon as by a cap screw 92. The control knob 68 is movable axially on the threads 89 in a direction dependent upon the direction of rotation of the control knob. Thus, with a standard right-hand thread, rotation of the control knob 68 in a clockwise direction, in the course of setting a common year in the manner described hereinabove, causes the control knob 68 to move leftwardly and in a rapid manner by reason of the relatively high pitch of the threads 89, as viewed in Fig. 1, andiinto engagement with the shoulder aiorded at the inner end of the threads 89. The pointer 88 is pivoted for rotation about a fulcrum 93, and a follower member. 94 is connected to the pointer 88 and biased toward engagement with' the control knob 68 as by a spring 96. Thus, the inclination of the pointer 88 is dependent upon the axial position of the control knob 68 on the threaded end 89 of the rod member 49, so that rotation of the control knob 68 in a clockwise direction moves the pointer 88 to indicate a common year setting while rotation of the control knob 68 in a counterclockwise direction, and outwardly on the threads 89, enables the pointer 88 to swing to the leap year designation.

Hence, whileI have illustrated and described the preferred embodiment of my invention, it is to be understood that this is capable of variation and modification,

Aand I therefore do not wish to be limited to the precise details lset forth, but desire to avail myself of "such changes'and alterations as fall within the purview of the following claims.

I claim: f

1. A perpetual; calendar for simultaneously showing a complete calendar for any selected year and comprisin'g'a plurality` of '.heptagonal-facedrods arranged 4'in groups corresponding"to'the'twelve months of a year, operating means for rotating ,the rods topresent to view different combinations Iof rod faces corresponding to diterent years, and means affording'substantiallyy oneseventh ofi a turn of relative-rotation betweenjheirods allocated'to the months yof n.lanuary'and Februaryand therods allocated to then remaining months of'the year to compensate for leap years.

2. A perpetual calendar for simultaneously showing a complete calendar including the dates of all of the days of any selectedyear and comprising a plurality of heptagonal-faced rods arranged in groups correspond ing to the twelve months of a year, operating means interconnecting the rods for rotation with one another and in equal angular amounts about their respective longitudinal axes to disposed one face of each rod in-a predetermined angular dispositionV in the calendar and thereby enable diierent combinations of rod faces corresponding to diierent years to be coordinately presented for view, and meansaiording a lost-motion connection between the rods allocated to the months of January,v

and February and the rods allocated to the remaining months of the year for enabling the rods allocated to to January and February to compensate for leap years.'

3. A perpetual calendar for simultaneously showing a completecalendar including the dates of all of the days of any selected year and Vcomprising 1a plurality u of heptagonal-faced rods arranged in groups correspond- .s ing to the twelve months of a year, operating means interconnecting the rods for rotation with one another and in equal angular'amounts about their respective longitudinal axes to place one face vof each rod in a predetermined angular ldisposition in the calendar and thereby 'enable diierent combinationsY of rod faces corresponding to diierent years to be coordinately presented for view, whereby seven different combinations of rod faces, corresponding to the seven days oi? a week on which a common year can start, can be obtained, andk means for compensating for leap years, said meansl c including a lost-motion connection between 'the rods allocated to the months of January andrFebruary and the rods allocated to the remaining months of theyear for enabling the rods allocated to March-throughDecember to be rotated one-seventh of a complete turn with respect tothe rods allocated Vto lJanuary and kFebruary .I to'compensate for leap years, whereby oneadditional .Y combination of rodjfaces can be effectedy for each'of f fourteen different combinations of yVrodffaces snilice 1.50

the above-noted seven combinations, l`so that a total of forany and all yearly set-ups.

' 4. A perpetual lcalendar lfor simultaneously/showing the dates of all of the daysof any selected year and comprising a Vplurality of heptagonal-facedrodsA ar ranged in groupsV corresponding to* the; twelve months-tof a year, voperatingmeans interconnecting' the; rodsj for# rotation with one another and in equal angular amounts about their respective longitudinal axestfo position one face of each 'rod ina predetermined angularr` disposition in the calendar and v'thereby enable different combinations of rod' facescorrespondi'ngto different years tofbeV coordinately presented for view, lmeans for" comp'er'isatingv for leap years, said means including va lost-motionconnection affording one-seventh of a complete turn ofgl vrelative rotation 'between' the ,rods allocated toythe' Y y months of January and February 'and ,the rodsv allocated to the remaining months ofthe year, and vvindicator means associated with said operating'fmeans for vvindic a'ting whether acommon yearora leap year hasbe'enselected(` 'Y 5. vA perpetual vcalendar as deiinet-iyin clairn'4sin cluding -latchingmeans for retaining lthe calendar in`any selected set-up.

V6. A perpetual'eaieadrffor simultneas@ novitgfin.

essere aconventional weekfbyweek calendar format dates otY all of 'the daysjof ,any selected year, said'perpetual-` calendar comprising a plurality of rods Aeach-` formed with seven longitudinally extendingfaces divided in seven 6 divisions for the seven daysof .afweek and having refer? ence knumerals inupredeterrninedA onesr of Ysaid divisions;l said rods beingarrangecl in groups corresponding to the twelve months of a year with suiicient rods in each group for presenting all possible weeks in any month, cover 10 means for disclosing to view all but one face of each rod,

said cover means having viewing apertures formed therein generally coextensive in length with a face on a rod and marked with month and day identifying data, operating means for rotating the rods in unison equal angular amounts about their respective longitudinal axes to present diierent combinations of rod faces corrponding to different years in viewing position at said apertures, and compensating means for selectively rotating the rods allocated to March through December one-seventh of a complete turn with respect to the rods allocated to January `and February to vary the starting dates o-f-March through December one day to compensate for leap years.

7. A perpetual calendar as dened in claim 6 wherein at least ve rods are allocated to February and six rods v `are allocated to each of the other months.

8. A perpetual calendar as defined in claim 6 wherein the rods are arranged to present the twelve months in a format ofthree vertically disposed groupsA of months with four horizontally aligned months in each group of Vmonths withV adjacent ends of rods allocatedk to given months in each four month group joined together except forr said lost-motion connection between the rods allocated to March and February. Y

' 9. A calendar Vfor simultaneously showing the dates of 'all of the days of any selected year and comprising a plul rality Vof heptagonal-faced rodsy arrangedv in groups corresponding to the twelvemonths of a year, frame means Imounting the rods for rotation about their longitudinal axes, operating means interconnecting the rods for 4rota- 40 tion with'on'e'another and in equal angular amounts about their respective ylongitudinal axes to place one face of each rod in a predetermined angular disposition in the calendar and thereby enable diferentcombinations of rod faces corresponding -tordiffferent years to be' coordinately presented Afor view, andv compensating means forselectively rotating the rods allocated to March through December one-,seventh of a complete-turn with respect to the rods I *allocated vto vJanuary through February; to vary the startthe operating means include sprocket and linkgbelt means interconnecting said rods for rotation with1one another.

"the 'compensating means include av pin andslot connec- ,55 tion between one Vof the rods allocated to March 'anda A corresponding'rod allocated to February.

k 4 L `-112. A perpetual calendar for simultaneously showing the datesjof all --of the days of any selected year,v 'said perpetual calendar comprising a plurality of rods each -m'eans` having viewing apertures formed thereinfgenerallyly oextensiveY in length Ywith 'agface on ja v rod fandj marked withmonth'and day identifying datay-PQI-atingmeans ing 'dates ofV March throughzDecember one 'day to coml 1l.V Al perpetual calendar as sdened in claim 9v wherein t 60' formed with Vseven longitudinally extending faces divided "iinseve'n divisions-for theseven 'days of a week and hav- A ingV reference numerals :formedin predetermined ronresof.

* -said "divisions, said. rods `being arrangedfin'v'groupscorg responding tothe twelvemonths ofsalfyearV with seient t rods'in eachjgroupfm presentingaall possible'weeks .in,'- v

anyrnonth, framenneansmounting'said'rodsfforfrotation' f in,saidhca'lendar and eiective'to align-oneface'c'ifffe'ach I l,

"f frodfin' substantially a common lplane,aover'means for dis-l f3'closing' to view onlyfsaid'onefa'c'e, ofeachfrodsafid cover (for rotating thejzrods infunirson.' equal'angulaizzaniountf` 75 abouttheir respective Vlongitudinal agres'toipresent;

ferent combinations of rodofaees. corresponding to different years in *viewing position at said apertures, and compensating means for selectively rotating the rods allocated to. March through December one-seventh of, a compiete.

References Citedinthe v'iileof this patent turnwith respect to the rods allocated to I anuarfy through 5v 2,575,929

February to `vary the starting dates oi March through Deember one day to compensate fon leap years.

UNITED STATES lPATENTS

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